<template>
  <div id="app">
    <transition name="fade" mode="out-in">
      <router-view v-if="isRouterAlive"></router-view>
    </transition>
  </div>
</template>

<script>
  export default {
    name: 'app',
    provide() { //父组件中通过provide来提供变量，在子组件中通过inject来注入变量。                                             
      return {
        reload: this.reload
      }
    },
    data() {
      return {
        isRouterAlive: true //控制视图是否显示的变量
      }
    },
    methods: {
      reload() {
        this.isRouterAlive = false; //先关闭，
        this.$nextTick(function () {
          this.isRouterAlive = true; //再打开
        })
      }
    }
  }

</script>

<style>
  #app {
    font-family: 'Avenir', Helvetica, Arial, sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-align: center;
    color: #2c3e50;
    margin-top: 0px;
  }

</style>
